To switch users on the same device, one will have to logout for the other to login.
If you purchased the Individual version, each account will have to be created under the different email addresses. Each account is unique from each other
To create another user, you may need to sign out from your current account. Click the Sign Up button again and enter a different email address (dummy accounts are acceptable).
Prepare the activation code as it will be asked after creating the account.
Community Associate at Typesy